00:01
Here we have a 1 litre buffer solution of 0 .29 molar, cs3coh and 0 .26 molar, cs3co minus.
00:17
And here we are adding 0 .71 moles of naoh to this buffer solution.
00:25
Also given that the ka value is 1 .8 into 10 raised to minus 5.
00:37
So first we can write the equation that is cs3 cooh gives h plus plus plus cs3 c .o minus.
00:53
So initially the molarity is 0 .29 molar and concentration of h plus 0, cs3 coo minus is 0 .26 molar.
01:05
And change is minus x smaller here will be plus x smaller and here also will be plus x smaller and equilibrium is 0 .29 minus x smaller this is x smaller and it is 0 .26 plus x smaller so k a is equal to 1 .8 into 10 raise to minus 5 which is concentration of h plus in to concentration of h plus into concentration of csd -zo minus divided by concentration of csd -zo -h, which is equal to x into 0 .26 plus x divided by 0 .29 minus x.
02:01
Here we know that ka is small and a common ion is present, so we expect x to be a small value.
02:09
So here we can, x will be small value and we can neglect this.
02:16
So, the simplified equation will be x into 0 .26 divided by 0 .29.
02:27
So here x is equal to 1 .8 into 10 degrees to minus 5 into 0 .29 divided by 0 .26...